Any scientific way to measure subject separation or DOF?

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Yannis1976
Yannis1976 Senior Member • Posts: 2,915
Any scientific way to measure subject separation or DOF?

Hi,

I keep reading about the max aperture effect on the DOF, but the actual subject separation is also a matter of FL, sensor, distance from the subject and distant of the background. So for example a 60mm/2.8 might achieve a better subject separation than a 25/1.4. Is there any way I could calculate the effect? Or if I wanted to choose the lens with the max subject separation because I like blurred backgrounds which of lenses below should I choose and why?

1) 60mm/2.8 (m43)

2) 45mm/1.7 (m43)

3) 25mm/1.4 (m43)

4) 35mm/1.2 at (APSC)

Thx

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